mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 11:58:21 +07:00
f55d966536
We're approaching 20 locations where we need to check for ELF ABI v2. That's fine, except the logic is a bit awkward, because we have to check that _CALL_ELF is defined and then what its value is. So check it once in asm/types.h and define PPC64_ELF_ABI_v2 when ELF ABI v2 is detected. We also have a few places where what we're really trying to check is that we are using the 64-bit v1 ABI, ie. function descriptors. So also add a #define for that, which simplifies several checks. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
#ifndef _ASM_POWERPC_SECTIONS_H
|
|
#define _ASM_POWERPC_SECTIONS_H
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/elf.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm-generic/sections.h>
|
|
|
|
#ifdef __powerpc64__
|
|
|
|
extern char __start_interrupts[];
|
|
extern char __end_interrupts[];
|
|
|
|
extern char __prom_init_toc_start[];
|
|
extern char __prom_init_toc_end[];
|
|
|
|
static inline int in_kernel_text(unsigned long addr)
|
|
{
|
|
if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned long kernel_toc_addr(void)
|
|
{
|
|
/* Defined by the linker, see vmlinux.lds.S */
|
|
extern unsigned long __toc_start;
|
|
|
|
/*
|
|
* The TOC register (r2) points 32kB into the TOC, so that 64kB of
|
|
* the TOC can be addressed using a single machine instruction.
|
|
*/
|
|
return (unsigned long)(&__toc_start) + 0x8000UL;
|
|
}
|
|
|
|
static inline int overlaps_interrupt_vector_text(unsigned long start,
|
|
unsigned long end)
|
|
{
|
|
unsigned long real_start, real_end;
|
|
real_start = __start_interrupts - _stext;
|
|
real_end = __end_interrupts - _stext;
|
|
|
|
return start < (unsigned long)__va(real_end) &&
|
|
(unsigned long)__va(real_start) < end;
|
|
}
|
|
|
|
static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
|
|
{
|
|
return start < (unsigned long)__init_end &&
|
|
(unsigned long)_stext < end;
|
|
}
|
|
|
|
static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
|
|
{
|
|
#ifdef CONFIG_KVM_GUEST
|
|
extern char kvm_tmp[];
|
|
return start < (unsigned long)kvm_tmp &&
|
|
(unsigned long)&kvm_tmp[1024 * 1024] < end;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
#ifdef PPC64_ELF_ABI_v1
|
|
#undef dereference_function_descriptor
|
|
static inline void *dereference_function_descriptor(void *ptr)
|
|
{
|
|
struct ppc64_opd_entry *desc = ptr;
|
|
void *p;
|
|
|
|
if (!probe_kernel_address(&desc->funcaddr, p))
|
|
ptr = p;
|
|
return ptr;
|
|
}
|
|
#endif /* PPC64_ELF_ABI_v1 */
|
|
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_POWERPC_SECTIONS_H */
|